#tile_puzzle {
    text-align: center;
}
#tile_puzzle #puzzle_table {
    display: inline-block;
    margin: 0 auto;
}
#tile_puzzle #puzzle_table td {
    width: 100px;
    height: 100px;
    border: solid 1px white;
    background-repeat: no-repeat;
    background-size: 100%;
}
#tile_puzzle form {

}
#tile_puzzle form input['button'] {

}